Use interlink-apptainer-plugin with ConfigMap-based configuration

[Copilot]

Switch the pilot-mode plugin to the standalone interlink-apptainer-plugin, which requires a YAML config file rather than env vars alone. The current PluginPodSpec had no way to mount files into the plugin container.

Changes

• API (PluginPodSpec): add volumes and volumeMounts fields, mirroring the standard Kubernetes container API, so users can inject a ConfigMap-backed ApptainerConfig.yaml into the plugin pod.
• Controller (buildPluginPodSpec): propagate the new fields into the generated PodSpec/container.
• Example (examples/pilot.yaml): replace the old image with ghcr.io/interlink-hq/interlink-apptainer-plugin:latest; add a ConfigMap with a full ApptainerConfig.yaml and wire it in via volumes/volumeMounts; replace the obsolete INTERLINK_PORT env var with APPTAINERCONFIGPATH.
• README: document the ConfigMap-mount pattern as the canonical way to configure the apptainer plugin.
• Test: add TestInterlinkMachineReconciler_PluginPodMode_VolumesAndMounts asserting volumes, volumeMounts, and env vars are correctly projected into the created pod.

Usage

pluginSpec:
  image: "ghcr.io/interlink-hq/interlink-apptainer-plugin:latest"
  port: 4000
  env:
    - name: APPTAINERCONFIGPATH
      value: "/etc/interlink/ApptainerConfig.yaml"
  volumes:
    - name: plugin-config
      configMap:
        name: apptainer-plugin-config   # ConfigMap with ApptainerConfig.yaml key
  volumeMounts:
    - name: plugin-config
      mountPath: /etc/interlink
      readOnly: true

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/interlink-hq/interlink-apptainer-plugin/releases/latest
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)